IFNG and neoplasm: The results showed that Ad-IFNγ efficiently expressed hIFNγ in NPC xenografts, the concentration of hIFNγ in tumor tissue was (136.5±25.5) pg/(mg tissue) at 24 hours post-injection of AdIFNγ, reached the peak of (265.8±26.2) pg/(mg tissue) at 72 hours, and then decreased gradually to (61.1±8.3) pg/(mg tissue) at day 7 (Figure 4A).